Thankyou for your comments (:
But the thing is that she won't talk to her parents at all, I brung it up once yet she refuses to. Do you know if she would be able to make an appointment with a councillor or something without her parents knowing?
yes it is possible. talk to your doctor about getting help or go see a counselor
Yes, it's very common. The only thing you can do as a friend is to encourage them to talk to their parents so they can be seen by a specialist for an evaluation, and let them know you're there for them.